IRIG Timecode

The IRIG time code ( abbreviation for Inter Range Instrumentation Group Time Code) is a common, especially in the military field of video recording, telemetry and other data records group of timecode. The Inter Range Instrumentation Group (IRIG ) is an organization of the United States Air Force at the site White Sands Missile Range and defines, among others, for tests of missiles capable of different standards.

Development and structure of the standard

The definition of the IRIG time code standards was launched in 1956 and was completed in 1960. The first standard was IRIG 104-60, followed by IRIG 104-70, 200-70, 200-95, 200-98 and 200-04. Current version is IRIG 200-04 (September 2004).

Within these standards, different and mutually incompatible time codes are defined as sub-groups, which are distinguished by an additional letter such as A, B, D, E, G, and H. The most common timecode is IRIG B, followed by IRIG G. The time code IRIG H is from the National Institute of Standards and Technology (NIST ) is used by more than American time signal transmitter stations such as WWV, WWVH and WWVB, an accurate time signal for radiating civilian use. Functionally, this service is similar to the German time signal transmitter DCF77.

The IRIG Time Code is divided into the following subgroups, which differ by the number of broadcast synchronization pulses per second, the data formats and the modulation techniques used from one another:

  • IRIG A: 1000 pulses per second
  • IRIG B: 100 pulses per second
  • IRIG D: 1 pulse per minute
  • IRIG E: 10 pulses per second
  • IRIG G: 10000 pulses per second
  • IRIG H: 1 pulse per second
WWV (radio station)
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